mportant: This document goes along with the code at https://github.com/OlivierLD/raspberry-pi4j-samples/. In the sources, refer to ADC The goal here is to read analog data from a Java program running on a Raspberry PI. For this example, we will be using a potentiometer like this one. When the user turns the knob of the potentiometer, its […]
Read analog data, in Java Raspberry PI Read More »
Those who have worked on simple microcontrollers know how difficult it is to continuously check for an input pin status without affecting the other task of the microcontroller like displaying and SSD, playing a music etc. In a Multitasking environment of an Operating system like Ubuntu a separate process can be created for checking the
How to Use Signal Values and Messages to Read Multiple Inputs Read More »
Raspberry Pi has a Broadcom BCM2835 chip, which controls 26 GPIO (general purpose input/output) pins. There are C library or RPi.GPIO python package available online that can be used to control the pins. The RPi.GPIO package is by default included in most Raspberry Pi system, such as Raspbian, a RPi version of Debian linux system. One
BeaconAir is a Raspberry Pi based project that reads the advertising packets coming from iBeacons and roughly calculates the physical position of BeaconAir by Trilateration. This is an application that uses my new iBeacon Python library that READS iBeacons on your Raspberry Pi. It does not turn your Raspberry Pi into an iBeacon. Lots of other people
BeaconAir On Raspberry Pi / iBeacons Read More »
The new Raspberry Pi model B+ uses Micro SD cards(WOOHOO!!!), wait what if I have SD cards from my old Pi’s I want to use? That is what this instructables was created to help you do. Thanks to the Raspberry Pi foundation and the community for all it’s help. Here is the original article that
Raspberry Pi B+ boot from SD Card Read More »
In this entry I will demonstrate how to interface the MCP3008; an SPI-based analog to digital converter (ADC) integrated chip, to the Raspberry Pi. This enables the Raspberry Pi to interpret analog voltages that are in turn typically emitted by analog-based sensors to reflect a measure of a physical characteristic such as acceleration, light intensity
Interfacing an SPI ADC (MCP3008) chip to the Raspberry Pi using C++ (spidev) Read More »
After damaging the GPIO port on our raspberry pi while designing a new solar monitoring system we decided that it might be a good idea to build a buffer/level translator to protect the GPIO pins from over voltage and ESD spikes. The board would need to protect all of the data pins we normally use
Raspberry Pi GPIO Protection Read More »
Description. Designing and building a USB sound card is no longer a head ache because we have got the PCM 2702 integrated circuit from Texas Instruments. The PCM2702 is an integrated 16 bit digital to analog converter that has two digital to analog output channels. The integrated interface controller of PCM2702 is compliant to the
We can see that the 5 volt line (+5V0) is powered directly from the USB input power, through a 1.1A, 6V Polyfuse (miniSMD). I believe this means that the 5V input is current limited to 1.1A (maximum hold current, not peak). Let’s assume that you’re powering the device from a regulated 5V supply capable of
How much power can be provided through USB? Read More »
Now that my robot has a Raspberry Pi on board I wanted to be able to send commands from the Raspberry Pi to the Arduino telling the robot what to do. In the future I also want the Arduino to be able to send sensor data back to the Raspberry Pi, so I need two
Communicating over serial between Raspberry Pi and Arduino. Read More »
